Airlift MBR at Municipal WWTP Terneuzen for Industrial ... - Evides

Introduction Project Scope
• The municipal wwtp Terneuzen is operated by Water Authority
‘Zeeuws-Vlaanderen’ in the Netherlands.
• Present capacity of the wwtp is 77,500 Pollution Equivalents.
• The plant was built in 1990, several extensions took place over
the years to meet stricter requirements for N- and P-removal.
• Since 2007 a volume of 5,000 m 3 per day of effluent is treated
by Evides Industry Water to produce demineralised water for
reuse at Dow Benelux.
• It is the first example of a combination of industrial and munici-
pal wastewater for reuse on a large scale in the Netherlands.
The wwtp of Terneuzen,
including the projected
upgrading with an airlift MBR
Principle of the NORIT air lift MBR
Bioreactor
and Objectives
• Upgrading is needed in the near future for improvement of the
effluent quality.
• The volume of effluent reuse has to be doubled before in 2010.
• The Terneuzen wwtp will be upgraded with an MBR system in
the year 2009.
• The MBR system will have a nominal hydraulic capacity of
400 m 3 /hr and a maximum hydraulic capacity of 620 m 3 /h.
• The permeate from the MBR will not be discharged into the
environment, but fed to an RO membrane unit for further
polishing and reuse as boiler feed water.
• To increase the hydraulic load to the MBR, clarifier overflow
of the existing wwtp will be added to the MBR.
• Currently a NORIT MBR Airlift pilot plant is operated and
generates process data to service the engineering for the
full scale MBR plant.
• Objectives for the pilot scale research are determining the
feasibility of different effluent addition schemes and the
maximum and operational membrane flux.
• In relation to the production of demineralised water the
requirements for the permeate are 10 mg/l for N-total and
2 mg/l for P-total.
Membrane feed
Air release
Air lift
Chemical cleaning
Backwash
Permeate
Pilot plant
Influent 80%
Effluent
1,000-
3,100 m 3 /h
20%
MBR
Future situation after upgrading the wwtp with the MBR
Addition clarifier overflow
Materials
and Methods
• Both the full scale and the pilot plant are equipped with
Airlift MBR by NORIT Membrane Technology (Enschede,
The Netherlands).
• The NORIT airlift has its first full scale application at the wwtp of
the town of Ootmarsum, The Netherlands (Futselaar et al, 2007).
• The pilot plant has a hydraulic capacity of 3 m 3 /h.
• The maximum gross flux amounts to 50 l/m 2 *h.
• Iron(III)chloride is added to the MBR for chemical P-removal
• For determining the sludge quality the Delft Filtration
Characterization Method (DFCM) method has been used
(Evenblij et al, 2005)
Industrial reuse
400-620 m 3 /h